例如：

android:id="@+id/account_option" android:layout_width="20px"

android:layout_height="20px" android:focusable="true"

android:src="@drawable/accountoptionbutton"

android:layout_alignParentRight="true" android:layout_marginRight="25px" />

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RelativeLayout rl =    new RelativeLayout(this);

MarginLayoutParams mp = new MarginLayoutParams(20,20);  //item的宽高

mp.setMargins(0, 0, 25, 0);//分别是margin_top那四个属性

LayoutParams lp = new LayoutParams(mp);

lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

Button bt = new Button(this);

bt.setLayoutParams(lp);

rl.addView(bt);